I am confused as to some properties of solving for DFT and DTFT. I am given...
I am confused as to some properties of solving for DFT and DTFT. I am given a series of x[n] values and have to determine the X[k]. The formula for R[k] is sum[x(n)cos(2pi*k*n/N)], which make sense. However, when I plug the values (1, -1, 1, -1) into the equation, I get zeros across the board. Matlab tell me that at k=2, R[2] should be 4, but the only way that make sense is if the summation is an alternating series.
So in short, my question is essentially: do we alternate the sign (+ or -) for the Real based on the sign of the given discrete signal values? And in turn, we do the same but opposite for the Imaginary number set?
So instead of R[k]=X[0]+X[1]+X[2]+X[3], we use X[0]-X[1]+X[2]-X[3]?
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I am confused as to some properties of solving for DFT and DTFT.
I am given...
So sorry for the long question, I am able to do a) and b) but not...
So sorry for the long question, I am able to do a) and b) but
not sure about the rest
2. Consider the DT LTI system defined by the impulse response h[n]-i[n]-?[n-1]. The input to this system is the signal rn: (a) Sketch hn and n (b) Determine the output of the system, y[n], using convolution. Sketch y[n (c) Determine the DTFTs H(ei) and X(e). Make fully-labeled sketches of the magn tudes of these DTFTs. (d) Recall that the discrete...
I need help with these problems It has been shown that the discrete Fourier transform(DFT) of a time hltk) for (k 0,1,2...
I need help with these problems
It has been shown that the discrete Fourier transform(DFT) of a time hltk) for (k 0,1,2, N -1). is given by V-1 k--0 Choosing N8 carry out the Cooley- Tukey formulation of FFT by following the ste below (a) Write the expressions for DFT H, in terms of hita) and the inverse DFT ht) in terms of f, for N = 8. (b) Define ". ear/N and rewrite (a) using w (c) Express (b)...
I will upvote if u will solve What u need? DFT can also be obtained using matrix multiplication. Let X[r] show the transformed values and x[n] show the original signal. Using the analysis equa...
I will upvote if u will solve
What u need?
DFT can also be obtained using matrix multiplication. Let X[r] show the transformed values and x[n] show the original signal. Using the analysis equation: Using matrix multiplication, this operation can be written as x[O X[1 1 e(2m/N) e-K4n/N) x12] [N-1]] e-j(2(N-1)T/N)e-j(4(N-1)m/N) Instead of huilt-in EFT function use matrix multinlication to solve 3th auestion [ 1 e-/(2(N-1)(N-1)T/N)]Le[N-1] DFT is an extension of DTFT in which frequency is discretized to a finite...
It has been shown n that the discrete Pourier transform(DFT) of a time-varying process discrete h(tk) for (k0,1,2,.. ,N - 1). is given by carry out the Cooley-Tukey formulation of FFT by followin...
It has been shown n that the discrete Pourier transform(DFT) of a time-varying process discrete h(tk) for (k0,1,2,.. ,N - 1). is given by carry out the Cooley-Tukey formulation of FFT by following the steps below. (a) Write the expressions for DFT H, in terms of h(ta) and the inverse DFT h(tk) in terms of Hn for N =8. (b) Define W e2x/N and rewrite (a) using W. (c) Express (b) in matrix form. (d) Express n and k in...
Hi, so I am confused on this problem. When I first look at this it seems...
Hi, so I am confused on this problem. When I first look at this it seems the P(0) and P(1) make sense but P(2) kind of seems high compared to P(3) Is anyone able to help me explain what or what doesn't make sense? Do these probabilities make sense? Use the values you found for P(3), the mean, and standard deviation to determine if P(0), P(1), and P(2) are reasonable and make sense. P(3)= 0.01458 Mean: 0.6 Standard Deviation: 0.73...
[20 total pts) Consider the sequences x1n] = { 1, 2,-2, 1}, and x2 [n] =...
[20 total pts) Consider the sequences x1n] = { 1, 2,-2, 1}, and x2 [n] = { 1, 2,-2, 1, 0, 0, 0, 0). The sequence x2In] is known as a zero-padded version of x,[n]. When answering the questions below, please use Table 1, provided on Page 3. a. [3 pts] Compute X1(eo), the Discrete-Time Fourier Transform (DTFT) of x1 [n], and evaluate it for the following values of normalized frequency: a-63 笎哮,쯤뀨 write the values in the table b....
Lab #2 Discrete-time Fourier Transform (DTFT) OBJECTIVES: • Explore the DTFT, its meanings and concepts. •...
Lab #2 Discrete-time Fourier Transform (DTFT) OBJECTIVES: • Explore the DTFT, its meanings and concepts. • Get acquainted with Matlab/Octave 1) Start MATLAB and change the “Current Directory” in the top of the window (or type) >> cd '' (example: >> cd 'C:\NIU\lab2') Alternatively, if you don't want to use MATLAB, you can open a web-browser and go to “octave-online.net”. 2) Download and execute LAB2forStudent_A.M with >> lab2forStudent_A and observe that it produces a Discrete-Time (DT) signal xVec. 3) TO...
I am trying to plot a time series model using R. So far I have the...
I am trying to plot a time series model using R. So far I have the following code, but I'm getting an error located at the very bottom. Can you please explain what I'm doing wrong, and what I should be doing instead in order to avoid the error? As far as the data is concerned, the first column displays time (hour-by-hour) across 20 days, giving 504 rows of data and the six columns thereafter display the bike demand/usage at...
4. [-/10 Points] DETAILS SCALCET8 11.8.AE.002. MY NOTES EXAMPLE 2 For what values of x does...
4. [-/10 Points] DETAILS SCALCET8 11.8.AE.002. MY NOTES EXAMPLE 2 For what values of x does the series § (x – 3)" converge? n = 1 SOLUTION Let a, = (x - 3)"/n. Then an + 1 n (x - 3)" 1x - 3 → as n 00. and divergent when x - 3 > Now By the Ratio test, the given series is absolutely convergent, and therefore convergent, when |x - 3|< |x - 3| <1 | <x -...
May you please explain all steps? I want to understand this and am so confused. Thanks!...
May you please explain all steps? I want to
understand this and am so confused.
Thanks!
1. (25 pts) Let F(x, y, z) = (2xy + 25)i + (4.r?y3 + 2yz?)j + (5.624 + 3y222)k and let C be the curve given parametrically by r(t) = (3t+1)i + tºj + 5tk for 0 <t<1. Evaluate the line integral (Fd
So sorry for the long question, I am able to do a) and b) but
not sure about the rest
2. Consider the DT LTI system defined by the impulse response h[n]-i[n]-?[n-1]. The input to this system is the signal rn: (a) Sketch hn and n (b) Determine the output of the system, y[n], using convolution. Sketch y[n (c) Determine the DTFTs H(ei) and X(e). Make fully-labeled sketches of the magn tudes of these DTFTs. (d) Recall that the discrete...
I need help with these problems
It has been shown that the discrete Fourier transform(DFT) of a time hltk) for (k 0,1,2, N -1). is given by V-1 k--0 Choosing N8 carry out the Cooley- Tukey formulation of FFT by following the ste below (a) Write the expressions for DFT H, in terms of hita) and the inverse DFT ht) in terms of f, for N = 8. (b) Define ". ear/N and rewrite (a) using w (c) Express (b)...
I will upvote if u will solve
What u need?
DFT can also be obtained using matrix multiplication. Let X[r] show the transformed values and x[n] show the original signal. Using the analysis equation: Using matrix multiplication, this operation can be written as x[O X[1 1 e(2m/N) e-K4n/N) x12] [N-1]] e-j(2(N-1)T/N)e-j(4(N-1)m/N) Instead of huilt-in EFT function use matrix multinlication to solve 3th auestion [ 1 e-/(2(N-1)(N-1)T/N)]Le[N-1] DFT is an extension of DTFT in which frequency is discretized to a finite...
It has been shown n that the discrete Pourier transform(DFT) of a time-varying process discrete h(tk) for (k0,1,2,.. ,N - 1). is given by carry out the Cooley-Tukey formulation of FFT by following the steps below. (a) Write the expressions for DFT H, in terms of h(ta) and the inverse DFT h(tk) in terms of Hn for N =8. (b) Define W e2x/N and rewrite (a) using W. (c) Express (b) in matrix form. (d) Express n and k in...
[20 total pts) Consider the sequences x1n] = { 1, 2,-2, 1}, and x2 [n] = { 1, 2,-2, 1, 0, 0, 0, 0). The sequence x2In] is known as a zero-padded version of x,[n]. When answering the questions below, please use Table 1, provided on Page 3. a. [3 pts] Compute X1(eo), the Discrete-Time Fourier Transform (DTFT) of x1 [n], and evaluate it for the following values of normalized frequency: a-63 笎哮,쯤뀨 write the values in the table b....
4. [-/10 Points] DETAILS SCALCET8 11.8.AE.002. MY NOTES EXAMPLE 2 For what values of x does the series § (x – 3)" converge? n = 1 SOLUTION Let a, = (x - 3)"/n. Then an + 1 n (x - 3)" 1x - 3 → as n 00. and divergent when x - 3 > Now By the Ratio test, the given series is absolutely convergent, and therefore convergent, when |x - 3|< |x - 3| <1 | <x -...
May you please explain all steps? I want to
understand this and am so confused.
Thanks!
1. (25 pts) Let F(x, y, z) = (2xy + 25)i + (4.r?y3 + 2yz?)j + (5.624 + 3y222)k and let C be the curve given parametrically by r(t) = (3t+1)i + tºj + 5tk for 0 <t<1. Evaluate the line integral (Fd
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